01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Place halved radishes in a large bowl. Add minced garlic, olive oil, salt, pepper, and thyme if using. Toss until radishes are evenly coated.
03 - Spread the seasoned radishes in a single layer on the prepared baking sheet, ensuring even spacing for proper roasting.
04 - Roast for 20 to 25 minutes, stirring halfway through, until radishes are golden and fork-tender.
05 - Transfer to a serving dish and sprinkle with fresh chopped parsley before serving, if desired.